Grammar Note
通常置于名词前作定语（如 self cells），较少用作表语；多用于生物学或医学语境。
自我；自身
先理解核心含义，再看它在真实句子里的用法。
自我；自身
Used as a combining form meaning of, by, to, from, or for the self.
The shirt has a self stripe, so the lines are the same color as the rest of the fabric.
这件衬衫是暗条纹的，条纹和面料其他部分的颜色相同。
用于构成合成词，如 self-confidence（自信）、self-taught（自学的）
在颜色、成分等方面具有自身或单一性质或特征的,无添加或变化；同类的；未混合的。
Having its own or a single nature or character throughout, as in colour, composition, etc., without addition or change; of the same kind; unmixed.
属于自身的任何分子、细胞或组织,与外来(非自身)的分子、细胞或组织相对(例如,感染性、同种异体或异种)。
Of or relating to any molecule, cell, or tissue of an organism's own (belonging to the self), as opposed to a foreign (nonself) molecule, cell, or tissue (for example, infective, allogenic, or xenogenic).
与自我相关的(用作合成形式)
(used as a combining form) relating to--of or by or to or from or for--the self
He made a self bow from one piece of wood, so it bends evenly without glue.
他用一整块木头做了一把单体弓，所以弓身不用胶水就能均匀弯曲。
The jacket has a self lining, which means the inside uses the same cloth as the outside.
这件夹克有同布衬里，也就是说内衬和外层用的是同一种布料。
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通常置于名词前作定语（如 self cells），较少用作表语；多用于生物学或医学语境。
该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
Collins 词频等级为 3，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.